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If you can route a shorter belt and do away with the smog pump altogether I would go with that. Otherwise the pumps usually have the main housing with a cover plate bolted to it. You need to get access to the inside of the pump, remove the internals, so that it is not pumping all time.
Spa circulation pumps are low flow, single speed pumps that run 24 hrs to keep your water filtered and heated. They run all the time, but are low energy use, drawing between 0.5 and 1.5 amps. Running all the time does accelerate wear and tear, and makes the average circ pump lifespan about 7-9 years.